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<p><strong><code>toLocaleUpperCase()</code></strong> 使用本地化（locale-specific）的大小写映射规则将输入的字符串转化成大写形式并返回结果字符串。</p>
<h2 id="语法">语法</h2>
<pre><code class="language-javascript"><code><var>str</var>.toLocaleUpperCase()</code></code></pre>
<h3 id="返回值">返回值</h3>
<p>一个新的字符串，即根据本地化的大小写映射规则将输入的字符串转化成大写形式的结果。</p>
<h2 id="描述">描述</h2>
<p><code>toLocaleUpperCase() 方法返回的是将输入的字符串根据本地化的大小写映射规则转化成的大写形式的新字符串。</code><code>toLocaleUpperCase()</code> 不会影响输入的字符串本身的值. 大多数情况下，这个方法与 <a href="Reference/Global_Objects/String/toUpperCase" title="toUpperCase() 将调用该方法的字符串值转换为大写形式，并返回。"><code>toUpperCase()</code></a> 会产生相同的值，但是对于一些语言（locale）,例如土耳其语，因为它们的大小写映射规则与Unicode默认的映射规则不同，所以调用这两个方法将会产生不同的结果。</p>
<h2 id="例子">例子</h2>
<h3 id="使用_toLocaleUpperCase()"><code>使用 toLocaleUpperCase()</code></h3>
<pre><code  class="language-javascript">console.log('alphabet'.toLocaleUpperCase()); // 'ALPHABET'
</code></pre>
<h2 id="规范">规范</h2>
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<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
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<td><a class="external" href="https://www.ecma-international.org/publications/files/ECMA-ST-ARCH/ECMA-262,%203rd%20edition,%20December%201999.pdf" hreflang="en" lang="en" rel="noopener" title="ECMAScript 3rd Edition (ECMA-262)">ECMAScript 3rd Edition (ECMA-262)</a></td>
<td><span class="spec-Standard">Standard</span></td>
<td>初始定义。在 JavaScript 1.2 中实现。</td>
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<td><a class="external" href="https://www.ecma-international.org/ecma-262/5.1/#sec-15.5.4.19" hreflang="en" lang="en" rel="noopener">ECMAScript 5.1 (ECMA-262)<br/><small lang="zh-CN">String.prototype.toLocaleUpperCase</small></a></td>
<td><span class="spec-Standard">Standard</span></td>
<td> </td>
</tr>
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<td><a class="external" href="https://www.ecma-international.org/ecma-262/6.0/#sec-string.prototype.tolocaleuppercase" hreflang="en" lang="en" rel="noopener">ECMAScript 2015 (6th Edition, ECMA-262)<br/><small lang="zh-CN">String.prototype.toLocaleUpperCase</small></a></td>
<td><span class="spec-Standard">Standard</span></td>
<td> </td>
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<td><a class="external" href="https://tc39.github.io/ecma262/#sec-string.prototype.tolocaleuppercase" hreflang="en" lang="en" rel="noopener">ECMAScript Latest Draft (ECMA-262)<br/><small lang="zh-CN">String.prototype.toLocaleUpperCase</small></a></td>
<td><span class="spec-Draft">Draft</span></td>
<td> </td>
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<h2 id="浏览器兼容性">浏览器兼容性</h2>
<div><div class="blockIndicator warning"><strong><a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">We're converting our compatibility data into a machine-readable JSON format</a></strong>.
            This compatibility table still uses the old format,
            because we haven't yet converted the data it contains.
            <strong><a class="new" href="/zh-CN/docs/MDN/Contribute/Structures/Compatibility_tables" rel="nofollow">Find out how you can help!</a></strong></div>
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<a id="AutoCompatibilityTable" name="AutoCompatibilityTable"></a>
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<li class="selected"><a>Desktop</a></li>
<li><a>Mobile</a></li>
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<th>Feature</th>
<th>Chrome</th>
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<th>Safari</th>
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<td>Basic support</td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
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<th>Feature</th>
<th>Android</th>
<th>Chrome for Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
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<td>Basic support</td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
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<h2 id="另见">另见</h2>
<ul>
<li><a href="Reference/Global_Objects/String/toLocaleLowerCase" title="toLocaleLowerCase()方法根据任何特定于语言环境的案例映射，返回调用字符串值转换为小写的值。"><code>String.prototype.toLocaleLowerCase()</code></a></li>
<li><a href="Reference/Global_Objects/String/toLowerCase" title="toLowerCase() 会将调用该方法的字符串值转为小写形式，并返回。"><code>String.prototype.toLowerCase()</code></a></li>
<li><a href="Reference/Global_Objects/String/toUpperCase" title="toUpperCase() 将调用该方法的字符串值转换为大写形式，并返回。"><code>String.prototype.toUpperCase()</code></a></li>
</ul>
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